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  5. The salesman knows nothing of what he is selling save that...

The salesman knows nothing of what he is selling save that he is charging a great deal too much for it.

Oscar Wilde
Business, Marketing, Too Much
Oscar Wilde (2015). “Essays and Lectures: Top Essays”, p.75, 谷月社
The salesman knows nothing of what he is selling save that he is charging a great deal too much for it.